摘要
基于一台压气机和经过改装的轻型柴油机实现了模拟增压状态下正丁醇与柴油的掺烧。试验研究了在转速1500 r/min、BMEP0.5 MPa、进气压力120 kPa的工况下,进气氧浓度分别为20.9%~16%(富氧阶段)、16%~12.5%(高温贫氧阶段)和12.5%~11%(低温贫氧阶段)情况下,柴油/正丁醇掺烧燃料随进气氧浓度降低对碳烟排放的影响规律。研究结果表明:随进气氧浓度从20.9%降低至11%,影响碳烟排放的主要因素从温度变为燃料氧,最后变为温度和燃料氧;在富氧阶段,由于氧气氛围较为充足,碳烟氧化对燃料氧的依赖作用较弱,影响碳烟生成的主要因素为温度;在高温贫氧阶段,氧气浓度较低,燃料氧是影响碳烟排放的主要因素,温度对碳烟的影响作用其次;在低温贫氧阶段,温度和燃料氧是影响碳烟排放的主要因素,滞燃期对碳烟排放几乎无影响作用。
N-butanol/diesel blended fuel combustion under simulated boost condition was accomplished on a compressor and a modified light duty diesel engine.The aim of this research is on effects of intake oxygen concentration variation on soot emission in n-butanol/diesel fuel blends combustion.The engine speed and load were keeping constant at 1500 r/min and 0.5 MPa BMEP respectively,and intake pressure was keeping constant at 120 kPa throughout the experiment.Intake oxygen concentration was divided into three stages,which were oxygen rich stage,high temperature oxygen deficiency stage and low temperature oxygen deficiency stage.Experimental results show that the main factor which affects soot emission changes from temperature into fuel oxygen and turns into both temperature and fuel oxygen in final as intake oxygen concentration decreased from 20.9%to 11%.In the oxygen rich stage,the main factor that affects soot emission is temperature due to the sufficient oxygen atmosphere.In the high temperature oxygen deficiency stage,fuel oxygen is the key factor because of the low intake oxygen concentration.In the low temperature oxygen deficiency stage,soot emission is mainly affected by both of temperature and fuel oxygen,and ignition delay period barely has effect on soot emission.
作者
楚云路
李均同
彭彤
袁逍蝶
韩志强
CHU Yunlu;LI Juntong;PENG Tong;YUAN Xiaodie;HAN Zhiqiang(School of Automobile&Transportation,Xihua University,Chengdu 610039,China)
出处
《机械》
2018年第A01期36-42,共7页
Machinery
基金
省科技厅项目(2017GZ0265)
四川省教育厅项目(13ZB0022)
关键词
正丁醇
燃料氧
温度
滞燃期
n-butanol
fuel oxygen
temperature
ignition delay period
